]>
Commit | Line | Data |
---|---|---|
3d1229d6 ME |
1 | /* |
2 | * Code to handle transition of Linux booting another kernel. | |
3 | * | |
4 | * Copyright (C) 2002-2003 Eric Biederman <ebiederm@xmission.com> | |
5 | * GameCube/ppc32 port Copyright (C) 2004 Albert Herranz | |
6 | * Copyright (C) 2005 IBM Corporation. | |
7 | * | |
8 | * This source code is licensed under the GNU General Public License, | |
9 | * Version 2. See the file COPYING for more details. | |
10 | */ | |
11 | ||
12 | #include <linux/kexec.h> | |
13 | #include <linux/reboot.h> | |
14 | #include <linux/threads.h> | |
95f72d1e | 15 | #include <linux/memblock.h> |
2e8e4f5b | 16 | #include <linux/of.h> |
c71635d2 | 17 | #include <linux/irq.h> |
ac4414e4 | 18 | #include <linux/ftrace.h> |
c71635d2 | 19 | |
3d1229d6 | 20 | #include <asm/machdep.h> |
d9b2b2a2 | 21 | #include <asm/prom.h> |
2e8e4f5b | 22 | #include <asm/sections.h> |
3d1229d6 | 23 | |
c71635d2 MM |
24 | void machine_kexec_mask_interrupts(void) { |
25 | unsigned int i; | |
4013369f | 26 | struct irq_desc *desc; |
c71635d2 | 27 | |
4013369f | 28 | for_each_irq_desc(i, desc) { |
e1180287 | 29 | struct irq_chip *chip; |
c71635d2 | 30 | |
ec775d0e | 31 | chip = irq_desc_get_chip(desc); |
e1180287 LB |
32 | if (!chip) |
33 | continue; | |
34 | ||
98488db9 | 35 | if (chip->irq_eoi && irqd_irq_inprogress(&desc->irq_data)) |
e1180287 | 36 | chip->irq_eoi(&desc->irq_data); |
c71635d2 | 37 | |
e1180287 LB |
38 | if (chip->irq_mask) |
39 | chip->irq_mask(&desc->irq_data); | |
c71635d2 | 40 | |
98488db9 | 41 | if (chip->irq_disable && !irqd_irq_disabled(&desc->irq_data)) |
e1180287 | 42 | chip->irq_disable(&desc->irq_data); |
c71635d2 MM |
43 | } |
44 | } | |
45 | ||
3d1229d6 ME |
46 | void machine_crash_shutdown(struct pt_regs *regs) |
47 | { | |
c1f784e5 | 48 | default_machine_crash_shutdown(regs); |
3d1229d6 ME |
49 | } |
50 | ||
51 | /* | |
52 | * Do what every setup is needed on image and the | |
53 | * reboot code buffer to allow us to avoid allocations | |
54 | * later. | |
55 | */ | |
56 | int machine_kexec_prepare(struct kimage *image) | |
57 | { | |
58 | if (ppc_md.machine_kexec_prepare) | |
59 | return ppc_md.machine_kexec_prepare(image); | |
77733f8a AV |
60 | else |
61 | return default_machine_kexec_prepare(image); | |
3d1229d6 ME |
62 | } |
63 | ||
64 | void machine_kexec_cleanup(struct kimage *image) | |
65 | { | |
3d1229d6 ME |
66 | } |
67 | ||
67238fb7 NH |
68 | void arch_crash_save_vmcoreinfo(void) |
69 | { | |
70 | ||
71 | #ifdef CONFIG_NEED_MULTIPLE_NODES | |
72 | VMCOREINFO_SYMBOL(node_data); | |
73 | VMCOREINFO_LENGTH(node_data, MAX_NUMNODES); | |
74 | #endif | |
75 | #ifndef CONFIG_NEED_MULTIPLE_NODES | |
76 | VMCOREINFO_SYMBOL(contig_page_data); | |
77 | #endif | |
78 | } | |
79 | ||
3d1229d6 ME |
80 | /* |
81 | * Do not allocate memory (or fail in any way) in machine_kexec(). | |
82 | * We are past the point of no return, committed to rebooting now. | |
83 | */ | |
3ab83521 | 84 | void machine_kexec(struct kimage *image) |
3d1229d6 | 85 | { |
ac4414e4 AB |
86 | int save_ftrace_enabled; |
87 | ||
88 | save_ftrace_enabled = __ftrace_enabled_save(); | |
89 | ||
357574c4 AB |
90 | if (ppc_md.machine_kexec) |
91 | ppc_md.machine_kexec(image); | |
92 | else | |
93 | default_machine_kexec(image); | |
77733f8a | 94 | |
ac4414e4 AB |
95 | __ftrace_enabled_restore(save_ftrace_enabled); |
96 | ||
77733f8a AV |
97 | /* Fall back to normal restart if we're still alive. */ |
98 | machine_restart(NULL); | |
3d1229d6 ME |
99 | for(;;); |
100 | } | |
47585d8f | 101 | |
47585d8f ME |
102 | void __init reserve_crashkernel(void) |
103 | { | |
edd8ce67 BW |
104 | unsigned long long crash_size, crash_base; |
105 | int ret; | |
106 | ||
edd8ce67 | 107 | /* use common parsing */ |
95f72d1e | 108 | ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), |
edd8ce67 BW |
109 | &crash_size, &crash_base); |
110 | if (ret == 0 && crash_size > 0) { | |
edd8ce67 | 111 | crashk_res.start = crash_base; |
eabd9094 | 112 | crashk_res.end = crash_base + crash_size - 1; |
edd8ce67 | 113 | } |
47585d8f | 114 | |
eabd9094 ME |
115 | if (crashk_res.end == crashk_res.start) { |
116 | crashk_res.start = crashk_res.end = 0; | |
47585d8f | 117 | return; |
eabd9094 | 118 | } |
47585d8f ME |
119 | |
120 | /* We might have got these values via the command line or the | |
121 | * device tree, either way sanitise them now. */ | |
122 | ||
28f65c11 | 123 | crash_size = resource_size(&crashk_res); |
eabd9094 | 124 | |
0f890c8d | 125 | #ifndef CONFIG_NONSTATIC_KERNEL |
47585d8f ME |
126 | if (crashk_res.start != KDUMP_KERNELBASE) |
127 | printk("Crash kernel location must be 0x%x\n", | |
128 | KDUMP_KERNELBASE); | |
129 | ||
130 | crashk_res.start = KDUMP_KERNELBASE; | |
66c721e1 MM |
131 | #else |
132 | if (!crashk_res.start) { | |
8aa6d359 | 133 | #ifdef CONFIG_PPC64 |
66c721e1 | 134 | /* |
8aa6d359 AB |
135 | * On 64bit we split the RMO in half but cap it at half of |
136 | * a small SLB (128MB) since the crash kernel needs to place | |
137 | * itself and some stacks to be in the first segment. | |
66c721e1 | 138 | */ |
8aa6d359 AB |
139 | crashk_res.start = min(0x80000000ULL, (ppc64_rma_size / 2)); |
140 | #else | |
66c721e1 | 141 | crashk_res.start = KDUMP_KERNELBASE; |
8aa6d359 | 142 | #endif |
66c721e1 MM |
143 | } |
144 | ||
145 | crash_base = PAGE_ALIGN(crashk_res.start); | |
146 | if (crash_base != crashk_res.start) { | |
147 | printk("Crash kernel base must be aligned to 0x%lx\n", | |
148 | PAGE_SIZE); | |
149 | crashk_res.start = crash_base; | |
150 | } | |
151 | ||
54622f10 | 152 | #endif |
edd8ce67 BW |
153 | crash_size = PAGE_ALIGN(crash_size); |
154 | crashk_res.end = crashk_res.start + crash_size - 1; | |
47585d8f | 155 | |
66c721e1 MM |
156 | /* The crash region must not overlap the current kernel */ |
157 | if (overlaps_crashkernel(__pa(_stext), _end - _stext)) { | |
158 | printk(KERN_WARNING | |
159 | "Crash kernel can not overlap current kernel\n"); | |
160 | crashk_res.start = crashk_res.end = 0; | |
161 | return; | |
162 | } | |
163 | ||
47585d8f ME |
164 | /* Crash kernel trumps memory limit */ |
165 | if (memory_limit && memory_limit <= crashk_res.end) { | |
166 | memory_limit = crashk_res.end + 1; | |
49a84965 | 167 | printk("Adjusted memory limit for crashkernel, now 0x%llx\n", |
a84fcd46 | 168 | memory_limit); |
47585d8f ME |
169 | } |
170 | ||
edd8ce67 BW |
171 | printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " |
172 | "for crashkernel (System RAM: %ldMB)\n", | |
173 | (unsigned long)(crash_size >> 20), | |
174 | (unsigned long)(crashk_res.start >> 20), | |
95f72d1e | 175 | (unsigned long)(memblock_phys_mem_size() >> 20)); |
edd8ce67 | 176 | |
95f72d1e | 177 | memblock_reserve(crashk_res.start, crash_size); |
47585d8f ME |
178 | } |
179 | ||
180 | int overlaps_crashkernel(unsigned long start, unsigned long size) | |
181 | { | |
182 | return (start + size) > crashk_res.start && start <= crashk_res.end; | |
183 | } | |
2e8e4f5b DF |
184 | |
185 | /* Values we need to export to the second kernel via the device tree. */ | |
bbc8e30f MM |
186 | static phys_addr_t kernel_end; |
187 | static phys_addr_t crashk_size; | |
2e8e4f5b DF |
188 | |
189 | static struct property kernel_end_prop = { | |
190 | .name = "linux,kernel-end", | |
bbc8e30f | 191 | .length = sizeof(phys_addr_t), |
2e8e4f5b DF |
192 | .value = &kernel_end, |
193 | }; | |
194 | ||
6f29c329 DF |
195 | static struct property crashk_base_prop = { |
196 | .name = "linux,crashkernel-base", | |
bbc8e30f | 197 | .length = sizeof(phys_addr_t), |
6f29c329 DF |
198 | .value = &crashk_res.start, |
199 | }; | |
200 | ||
201 | static struct property crashk_size_prop = { | |
202 | .name = "linux,crashkernel-size", | |
bbc8e30f | 203 | .length = sizeof(phys_addr_t), |
6f29c329 DF |
204 | .value = &crashk_size, |
205 | }; | |
206 | ||
4bc77a5e SP |
207 | static struct property memory_limit_prop = { |
208 | .name = "linux,memory-limit", | |
209 | .length = sizeof(unsigned long long), | |
210 | .value = &memory_limit, | |
211 | }; | |
212 | ||
6f29c329 DF |
213 | static void __init export_crashk_values(struct device_node *node) |
214 | { | |
215 | struct property *prop; | |
216 | ||
217 | /* There might be existing crash kernel properties, but we can't | |
218 | * be sure what's in them, so remove them. */ | |
219 | prop = of_find_property(node, "linux,crashkernel-base", NULL); | |
220 | if (prop) | |
221 | prom_remove_property(node, prop); | |
222 | ||
223 | prop = of_find_property(node, "linux,crashkernel-size", NULL); | |
224 | if (prop) | |
225 | prom_remove_property(node, prop); | |
226 | ||
227 | if (crashk_res.start != 0) { | |
228 | prom_add_property(node, &crashk_base_prop); | |
28f65c11 | 229 | crashk_size = resource_size(&crashk_res); |
6f29c329 DF |
230 | prom_add_property(node, &crashk_size_prop); |
231 | } | |
4bc77a5e SP |
232 | |
233 | /* | |
234 | * memory_limit is required by the kexec-tools to limit the | |
235 | * crash regions to the actual memory used. | |
236 | */ | |
237 | prom_update_property(node, &memory_limit_prop); | |
6f29c329 DF |
238 | } |
239 | ||
2e8e4f5b DF |
240 | static int __init kexec_setup(void) |
241 | { | |
242 | struct device_node *node; | |
243 | struct property *prop; | |
244 | ||
245 | node = of_find_node_by_path("/chosen"); | |
246 | if (!node) | |
247 | return -ENOENT; | |
248 | ||
249 | /* remove any stale properties so ours can be found */ | |
250 | prop = of_find_property(node, kernel_end_prop.name, NULL); | |
251 | if (prop) | |
252 | prom_remove_property(node, prop); | |
253 | ||
254 | /* information needed by userspace when using default_machine_kexec */ | |
255 | kernel_end = __pa(_end); | |
256 | prom_add_property(node, &kernel_end_prop); | |
257 | ||
6f29c329 DF |
258 | export_crashk_values(node); |
259 | ||
2e8e4f5b DF |
260 | of_node_put(node); |
261 | return 0; | |
262 | } | |
263 | late_initcall(kexec_setup); |